Engine exhaust muffler



June 10, 1958 E. A. KLIEWER, SR

' ENGINE EXHAUST MUFFLER Filed Aug. 30, 1955 INVENTOR Z14. fiZz cn er,5'.

ATTORNEYS United States Patent ENGINE EXHAUST MUFFLER Edward A. Kliewer,Sn, Longview, Tex.

Application August 30, 1955, Serial No. 531,451

4 Claims. (Cl. ISL-57) The invenion relates generally to soundcontrolling de- Vices and primarily seeks to provide a novel inuflierstructure for use in connection with internal combustion engines ofgasoline and diesel types, especially mufilers of the heavy duty typeemployed on trucks or buses. An object of the invention is to provide amufiler structure which is simple in construction and subject to beingeconomically manufactured, and which is efiicient in muflling the noisesnormally resulting from the exhausting of burnt gases from internalcombustion engines by permitting rapid and yet controlled expansion ofthe exhaust gases as they enter the mufiier in a manner forsubstantially eliminating any appreciable setting up of back-pressure atthe en ine to which the muffler is attached, thereby to aid in assuringefficient and economical running of the engine, and also long life ofboth the engine and the mother structure.

In its more detailed nature the invention resides in providing a mufflerstructure of the character stated ineluding an imperforate outer shellclosed at its ends except for the provision of an entrance tube openingcentrally into the casing at one end, and a discharge or outlet tubeopening centrally out of the tube at the other end and extending aconsiderable distance into the easing where it is traversed by a bafiledisk spaced at its periphery from the inner wall of the casing, theportion of the outlet tube extending into the casing being perforated sothat exhaust gases passing about the peripheral edge of the bailie canpass inwardly into the outlet .tube and exhaust therethrough.

Another object of the invention is to provide a muffler structure of thecharacter stated wherein the battle disk .is dished to present a smoothconvex surface in opposition to the exhaust gases entering and expandingin the casing.

A further object of the invention is to provide a muffier structure ofthe character stated wherein the peripheral edge portion of the baflledisk is notched or serrated.

A still further object of the invention is to provide a mufflerstructure of the character stated wherein the bafile disk is providedwith a central opening through which exhaust gases may pass directlyinto the outlet tube.

With the above and other objects in view that will hereinafter appear,the nature of the invention will be more clearly understood by referenceto the following detailed description, the appended claims, and theseveral views illustrated in the accompanying drawings.

In the drawings:

Figure l is a central longitudinal sectional view illustrating theimproved muffler structure, the section being taken on the line 11 onFigure 2.

Figure 2 is a vertical cross section taken on the line 2-2 on Figure 1.

Figure 3 is a vertical cross section taken on the line 3-3 on Figure 1.

Figure 4 is a detailed face view illustrating a modified form of bathedisk.

2,838,128 Patented June 10, 1958 In the example of embodiment of theinvention herein disclosed the mufiier structure includes an imperforatecylindrical outer casing 5 to which end closure rings 6 and '7 aresecured, by welding or otherwise, as at 8.

An entrance duct or tube 9 is welded or otherwise secured as at it) inthe central opening in the casing end closure 6 so that exhaust gasesreceived in the tube 9 may enter the receiving end of the casing 5 andrapidly expand therein in the manner clearly indicated by the arrows onFigure 1.

Intermediately of the ends 6 and 7 of the casing 5 there is provided adished baffle plate 11, the same being provided with radially extendingsupport members 12 which may be welded or otherwise secured at 13 to theinterior wal of the casing 5 in the manner clearly illustrated inFigures 1 and 2. It will be apparent by reference to these figures thatthe plate 11 is so dimensioned that its peripheral edge portion isspaced inwardly from the casing 5 so as to provide an annular passagesurrounding said plate and inwardly of the interior wall of the casing.It will also be noted that the plate 11 is so placed that it traversesthe casing intermediately of the ends thereof with its smooth convexsurface directed toward the incoming exhaust gases so as to smoothlydivert them outwardly toward the annular space surrounding the plate. Ifdesired, the peripheral edge portion of the baii'ie plate it may benotched or serrated as at 14, and the plate may also be provided with acentral aperture through which exhaust gases may pass directly throughthe center of said plate.

An outlet tube is welded or otherwise secured at 17 at the centralopening of the discharge end closure 7 of the casing, and this tubeextends a considerable distance into the casing and is welded orotherwise secured at is? to the concave face of the bafiie plate 11. Itwill also be apparent by reference to Figures 1 and 2 that the portionof the outlet tube 16 extending axially into the interior oi the casing23 is provided with a great number of apertures 19 opening inwardly fromthe annular space surrounding the tube it; within the casing 5 into theinterior of the tube.

The arrows applied on Figure 1 make it clearly apparent that the exhaustgases entering the receiving tube 9 expand rapidly in the casing 5, somethereof passing directly through the central aperture 15 in the baflieplate ll, and the remainder passing about the peripheral edge of thebattle plate into the discharge end of the casing, and thence inwardlythrough the tube apertures 19, and then axially along and out of thedischarge tube 16 to the atmosphere. in this tortuous passage throughthe improved mother structure the exhaust gases are efficiently silencedwithout any appreciable building up of back-pressure in the receivingtube 9 and the passages connecting the same with the engine beingserved.

In Figure 4 of the drawing there is illustrated a modified form ofbafiie plate 29 which is devoid of any central aperturing and which hasa continuous, smooth edged periphery 21, as distinguished from thenotched or serrated peripheral of the previously described baffle plate.It should therefore be apparent that bafiie plates with or withoutcentral aperturing and the peripheral edge notching can be empioyed, andit should also be understood that variations in the size and length ofthe casing 5 and the spacing of the peripheral edge of the bafile platewithin said casing may be resorted to without departing from the spiritand scope of the invention as outlined in the appended claims.

I claim:

1. An engine exhaust muffler consisting of a generally cylindricalcasing, having an entrant end and a discharge end, an exhaust gasreceiving tube delivering axially into the casing, an exhaust gasdischarging tube delivering axially from the discharge end of the casingand extending axially in the casing to a point intermediately of thelength thereof to provide an annular space surrounding the dischargingtube within the casing, and a bafile plate rigidly secured to andtraversing and abutting the end of the discharging tube Within thecasing and dividing the casing into an expanding chamber extendingthroughout at least half of the length of the casing into which thereceiving tube delivers and the before mentioned annular space, saidplate being dimensioned to leave a clear annular space surrounding theplate within the casing, and the discharging tube portion within thecasing having apertures therein throughout the length thereof betweenthe portion thereof abutting the baffle and the portionthereof extendingthrough the casing discharge end whereby exhaust gases entering thecasing through the receiving tube will expand in the expanding chamberthen pass through the clear annular space surrounding the bafiie plateinto the annular space surrounding the apertured portion of thedischarge tube then inwardly into the discharge tube through itsapertures to be discharged axially through the discharge tube 2. Amuflier structure as defined in claim 1 wherein the baflle plate portiontraversing the discharge tube is apertured so that some of the gasesreceived in the expanding chamber can pass directly into the dischargetube.

3. A rnufiler structure as defined in claim 1 wherein the baffle plateis concave-convex in shape and is placed with its convex face opposed togases expanding in the expanding chamber and with its concave faceagainst the u tube end abutted by the baflie plate.

4. An engine exhaust mufiler consisting of a generally cylindricalcasing, having an entrant end and a discharge 4 7 end, an exhaust gasreceiving tube delivering axially into the casing, an exhaust gasdischarging tube delivering axially from the discharge end of the casingand extending axially in the casing to a'point intermediately of thelength thereof to provide an annular space surrounding the dischargingtube Within the casing, and a bafiie plate rigidly secured to andtraversing and abutting the end of the discharging tube within thecasing and dividing the casing into an expanding chamber extendingthroughout at least half of the length of the casing and into which thereceiving tube delivers and the before mentioned annular space, saidplate being dimensioned to leave a clear annular space surrounding theplate within the easing, and the discharging tube portion Within thecasing having apertures therein throughout the length thereof betweenthe portion thereof abutting the battle and the portion thereofextending through the casing discharge end whereby exhaust gasesentering the casing through the receiving tube will expand intheexpanding chamber then ass throu h the clear annular s ace surroundinthe bafile plate into the annular space surrounding the aperturedportion of the discharge tube then inwardly References Cited in the fileof this patent UNITED STATES PATENTS Sharpe Dec. 5, 1905 Chipley Apr.22, 1941

